9=7d-4d+9

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Solution for 9=7d-4d+9 equation: 


d in (-oo:+oo)

9 = 7*d-(4*d)+9 // - 7*d-(4*d)+9

4*d-(7*d)-9+9 = 0

4*d-7*d-9+9 = 0

-3*d = 0 // : -3

d = 0

d = 0

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